Even though I haven't tried it yet, there's some good info on the web I've found. You can look at this site for a pictorial overview of the micropropagation process for bananas. You can get additional info at the Texas A&M website.

Also, this is not an ad, but if you wanna get everything in one kit, you can check out this this site. You'd probably have to specify that you're interested in working on bananas, so that they give you the right media, etc.